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Allowance for Loan and Lease Losses - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Ending balance | $ 40,790 |  | $ 43,410 |  |  |
Total | 4,859,517 |  | 4,837,735 |  |  |
Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 900 |  | 3,762 |  |  |
Collectively evaluated for impairment | 39,789 |  | 39,559 |  |  |
Ending balance | 40,689 | $ 40,245 | 43,321 | $ 41,111 | $ 40,107 | $ 39,686
Individually evaluated for impairment | 11,678 |  | 14,167 |  |  |
Collectively evaluated for impairment | 4,600,520 |  | 4,558,370 |  |  |
Total | 4,612,198 |  | 4,572,537 |  |  |
Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 101 |  | 89 |  |  |
Ending balance | 101 | 83 | 89 | 114 | 104 | 85
Individually evaluated for impairment | 3,504 |  | 3,438 |  |  |
Loans acquired with deteriorated credit quality | 10,464 |  | 11,036 |  |  |
Collectively evaluated for impairment | 233,351 |  | 250,724 |  |  |
Total | 247,319 |  | 265,198 |  |  |
Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total | 1,043,789 |  | 1,077,635 |  |  |
Commercial and industrial | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 300 |  | 397 |  |  |
Collectively evaluated for impairment | 11,243 |  | 10,820 |  |  |
Ending balance | 11,543 | 11,523 | 11,217 | 12,866 | 12,431 | 11,812
Individually evaluated for impairment | 1,770 |  | 1,864 |  |  |
Collectively evaluated for impairment | 1,000,581 |  | 1,032,059 |  |  |
Total | 1,002,351 |  | 1,033,923 |  |  |
Commercial and industrial | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 55 |  |  |
Ending balance | 0 | 0 | 55 | 19 | 25 | 25
Individually evaluated for impairment | 12 |  | 32 |  |  |
Loans acquired with deteriorated credit quality | 184 |  | 153 |  |  |
Collectively evaluated for impairment | 41,242 |  | 43,527 |  |  |
Total | 41,438 |  | 43,712 |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total | 2,401,976 |  | 2,340,661 |  |  |
Commercial real estate | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 600 |  | 3,365 |  |  |
Collectively evaluated for impairment | 20,354 |  | 20,118 |  |  |
Ending balance | 20,954 | 21,045 | 23,483 | 20,770 | 20,402 | 20,412
Individually evaluated for impairment | 5,938 |  | 8,388 |  |  |
Collectively evaluated for impairment | 2,229,275 |  | 2,153,181 |  |  |
Total | 2,235,213 |  | 2,161,569 |  |  |
Commercial real estate | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 51 |  | 0 |  |  |
Ending balance | 51 | 25 | 0 | 25 | 0 | 0
Individually evaluated for impairment | 861 |  | 842 |  |  |
Loans acquired with deteriorated credit quality | 5,800 |  | 5,852 |  |  |
Collectively evaluated for impairment | 160,102 |  | 172,398 |  |  |
Total | 166,763 |  | 179,092 |  |  |
Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total | 1,324,206 |  | 1,333,894 |  |  |
Residential real estate | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 6,853 |  | 7,317 |  |  |
Ending balance | 6,853 | 6,404 | 7,317 | 6,147 | 5,972 | 6,161
Individually evaluated for impairment | 3,970 |  | 3,915 |  |  |
Collectively evaluated for impairment | 1,281,923 |  | 1,288,346 |  |  |
Total | 1,285,893 |  | 1,292,261 |  |  |
Residential real estate | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 44 |  | 28 |  |  |
Ending balance | 44 | 58 | 28 | 65 | 73 | 54
Individually evaluated for impairment | 2,631 |  | 2,564 |  |  |
Loans acquired with deteriorated credit quality | 4,480 |  | 5,031 |  |  |
Collectively evaluated for impairment | 31,202 |  | 34,038 |  |  |
Total | 38,313 |  | 41,633 |  |  |
Consumer and other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total | 73,689 |  | 70,989 |  |  |
Consumer and other | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 1,339 |  | 1,304 |  |  |
Ending balance | 1,339 | 1,273 | 1,304 | 1,328 | 1,302 | 1,301
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 72,884 |  | 70,228 |  |  |
Total | 72,884 |  | 70,228 |  |  |
Consumer and other | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 6 |  | 6 |  |  |
Ending balance | 6 | 0 | 6 | 5 | 6 | 6
Individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 805 |  | 761 |  |  |
Total | 805 |  | 761 |  |  |
Covered loans | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Ending balance | 0 |  | 0 | 0 | 0 | 0
Individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Total | 0 |  | 0 |  |  |
Finance Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total | 15,857 |  | 14,556 |  |  |
Finance Leases | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Ending balance | 0 | 0 | 0 | $ 0 | $ 0 | $ 0
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 15,857 |  | 14,556 |  |  |
Total | 15,857 |  | 14,556 |  |  |
Finance Leases | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Ending balance | 0 | $ 0 |  |  |  |
Total | $ 0 |  | $ 0 |  |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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